不确定性

To weaken the influences of the position-dependent periodic disturbances and parameter uncertainties, the robust repetitive controller was designed, which associated structure singular value theory with the discrete-time repetitive control theory. The problem of robust repetitive control was transformed into one of H∞ optimal control using linear fractional transformation. The robust repetitive controller was achieved using D-K iteration procedure and made the servo system have stability, robustness and tracking performance.

为了削弱周期性扰动及参数变化不确定性的影响，将重复控制和结构奇异值理论相结合，利用线性分式变换(linear fractional transformation，LFT)将鲁棒重复控制问题转换成H∞最优控制问题，采用D-K迭代法设计鲁棒重复控制器(robust repetitive controller，RRC)，实现系统的稳定性和鲁棒性，提高系统的跟踪特性。

By using methods of passivity and switching control, the linear subsystem is transformed into a robust strictly passive system and it is asymptotically stable independent of the switching policy.

用同样的方法解决了一类具有结构不确定性的多输入非线性级联系统的鲁棒不变切换控制问题。

By the feedback linearization, the previous nonlinear system is turned into a six-degree linear subsystem and a one-degree internal dynamics subsystem.

在转动惯量不确定性以及轨控大干扰力矩存在的情况下，对闭环控制系统进行了大角度姿态运动数字仿真。

On the background that frequent disruptions occur in the logistics,there is a kind of disruption,which is caused by the request changes of customers,such as,new requests by the new customers,requests cancelling,service in advance/lingeringly,and demand changes,and when they occur,not only the customers disrupted are not serviced according to the plan,but also the customers in succession to them are affected.

在物流配送过程中经常发生的对正常物流配送产生干扰和不良影响事件中，有一类干扰是来自于顾客方面的不确定性，表现为顾客取消需求，新的顾客提出服务请求，顾客突然提出了提前或延后交货、变动交货地点或者改变了需求量等。

Because of the complexity of things and the fuzziness of human thoughts, decision makers often give the decision information in linguistic form.

由于客观事物的复杂性、不确定性以及人类思维的模糊性，决策者往往以语言形式给出决策信息。

On the one hand, monetary trends have been influenced by considerable uncertainty in financial markets and therefore partly reflect a strong liquidity preference among investors.

一方面，货币供应量的走势受到了金融市场中巨大的不确定性的影响，因而在一定程度上反映了投资者对于流动资金的强烈偏好。

Post-Keynesian economics represents a dissent from mainstream Keynesian economics, emphasizing the importance of demand in the long run as well as the short, and the role of uncertainty , liquidity preference and the historical process in macroeconomics.

后凯恩斯主义经济学的一个持不同政见者从主流的凯恩斯经济学，强调需求的重要性，从长远来看，以及短期和作用的不确定性，流动性偏好和历史进程的宏观经济。

The shifting "demographic" implications of the transitory nature of online identity and how we will adapt to two very different "states" of identity – one where we are the "same" person all the time due to the melding of our work, social and personal lives online; and two, the liquidness with which we morph and evolve our identities.

不断变化的人口统计数据暗示着在线身份的短暂特点纺我们将如何应用这两个差别很大的身份"状态"——其中一个是由于工作，社会环境和个人网络生活的融合我们一直是"同一类"人（这是你在谷歌搜索的结果）；第二个是我们的身份变体并演化的不确定性。

Acid-fracturing treatment and testing technology level have great impact for testing production. The reservoir can be damaged easily and the uncertainty for calibrating log interpretation will increase according to testing conclusions.⑶ Lithology complex (quartz sandstone, lithic sandstone, arcose), the reservoir has different characteristics with different lithology. Conventional log interpretation methods can not accurately identify the various sandstone.

酸化压裂和试油工艺水平对测试产能的影响很大，储层容易被伤害，使根据试油气结论进行测井解释标定的不确定性增大；⑶岩性（石英砂岩、岩屑砂岩、长石砂岩）复杂，不同岩性的储层具有不同的特征，常规测井解释方法无法准确的识别各类砂岩岩性等。

The effects of any one of uncertain structural parameters or load on the displacement and stress are examined by some interval models.

通过构造几种区间模型考察了任一结构参数和荷载的不确定性对应力的影响。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。